He's not the messiah, he's a very naughty boy!!!

"Um, I'd like to have an argument please."

What's the air speed velocity of an unladen swallow?

african or european?

'Tis but a flesh wound from monty python and the holy grail

Your mother was a hamster and your father smelt of elderberries! now go away or i shall taunt you a second time!

Upper Class Twit of the Year.

Philosopher football and the communist game show.

Oh and the 4 Yorkshiremen

Haven't seen as many of them as you guys but I really liked "The funniest joke ever"- the one where this guy invents a joke so funny it kills anyone who hears or reads it. And when the British gov't uses it against the Nazis, more lulz ensues.
Interestingly enough, you do hear the actual joke in the sketch, and it's not even really funny enough to make you laugh at all. (And certainly not funny enough to cause a fatal heart attack!)